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Share-Based Compensation - Summary of Movements in Shares (Detail)
 6 Months Ended
Jun. 30, 2018
shares
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 4,297,680
Potential Shares, Granted 1,319,604
Potential Shares, Over performance 295,517
Potential Shares, Vested (182,716)
Potential Shares, Forfeited (161,222)
Potential Shares, Ending balance 5,568,863
Performance-Based RSU [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 3,257,840
Potential Shares, Granted 701,109
Potential Shares, Over performance 295,517
Potential Shares, Vested (34,580)
Potential Shares, Forfeited (134,163)
Potential Shares, Ending balance 4,085,723
Restricted Stock Units [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 944,500
Potential Shares, Granted 587,786
Potential Shares, Vested (80,000)
Potential Shares, Forfeited (27,059)
Potential Shares, Ending balance 1,425,227
Equity Awards Plans [member]  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance 95,340
Potential Shares, Granted 30,709
Potential Shares, Vested (68,136)
Potential Shares, Ending balance 57,913